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.\" ========================================================================
.\"
.IX Title "SSL_CTX_add_session 3"
.TH SSL_CTX_add_session 3 2019-12-20 1.0.2u OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
SSL_CTX_add_session, SSL_add_session, SSL_CTX_remove_session, SSL_remove_session \- manipulate session cache
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c);
\& int SSL_add_session(SSL_CTX *ctx, SSL_SESSION *c);
\&
\& int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c);
\& int SSL_remove_session(SSL_CTX *ctx, SSL_SESSION *c);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_add_session()\fR adds the session \fBc\fR to the context \fBctx\fR. The
reference count for session \fBc\fR is incremented by 1. If a session with
the same session id already exists, the old session is removed by calling
\&\fBSSL_SESSION_free\fR\|(3).
.PP
\&\fBSSL_CTX_remove_session()\fR removes the session \fBc\fR from the context \fBctx\fR.
\&\fBSSL_SESSION_free\fR\|(3) is called once for \fBc\fR.
.PP
\&\fBSSL_add_session()\fR and \fBSSL_remove_session()\fR are synonyms for their
SSL_CTX_*() counterparts.
.SH NOTES
.IX Header "NOTES"
When adding a new session to the internal session cache, it is examined
whether a session with the same session id already exists. In this case
it is assumed that both sessions are identical. If the same session is
stored in a different SSL_SESSION object, The old session is
removed and replaced by the new session. If the session is actually
identical (the SSL_SESSION object is identical), \fBSSL_CTX_add_session()\fR
is a no-op, and the return value is 0.
.PP
If a server SSL_CTX is configured with the SSL_SESS_CACHE_NO_INTERNAL_STORE
flag then the internal cache will not be populated automatically by new
sessions negotiated by the SSL/TLS implementation, even though the internal
cache will be searched automatically for session-resume requests (the
latter can be suppressed by SSL_SESS_CACHE_NO_INTERNAL_LOOKUP). So the
application can use \fBSSL_CTX_add_session()\fR directly to have full control
over the sessions that can be resumed if desired.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following values are returned by all functions:
.IP 0 4
.Vb 3
\& The operation failed. In case of the add operation, it was tried to add
\& the same (identical) session twice. In case of the remove operation, the
\& session was not found in the cache.
.Ve
.IP 1 4
.IX Item "1"
.Vb 1
\& The operation succeeded.
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3),
\&\fBSSL_CTX_set_session_cache_mode\fR\|(3),
\&\fBSSL_SESSION_free\fR\|(3)